This will unpack a root folder (admob-rewarded-video-master), which contains a directory specific to either Android or iOS. For this codelab you'll navigate to the Android directory. The Android directory contains the start state for this codelab, located in the work directory. The end state for this codelab is located in the final directory. Both work and final directories contain an Android project within a subdirectory named RewardedVideoExample.
It just seems irresponsible for an app to play video if someone is on mobile data... like FAcebook's auto-play videos which thankfully you can set to only work on WiFi (or not at all)... it seems this model is quite common so it's a bit weird the central ad service(?) does't follow this. In many scenarios I wouldn't have good enough signal for video anyway... what happens then? – Mr. Boy Jul 28 '16 at 13:37
PropellerAds is best for your app if you don’t have the audience size to get into one of the bigger video ad networks yet. It’s also great if you don’t have the resources to go through a long sign-up process or optimize ads right away. It may be less appealing if you do have a huge audience, however, as you won’t get the preferential treatment you may feel entitled to at your app’s size.